port installed requested shows the ports you requested—the ones you explicitly installed. It does not include their dependencies.
If for some reason the list is inaccurate, you can correct it using the commands sudo port setrequested (to add ports to the list that are missing) or sudo port unsetrequested (to remove ports from the list that shouldn't be there).
For other questions about how to use MacPorts, writing to the macports-users mailing list is better. The issue tracker is for bug reports, feature requests, etc.
